On the agency client screen bottom white space is added

Hiding unnecessary space on agency client screen bottom when the dropdown box is displayed.

A24Group/Triage#4553

__Testing Instructions__
1. Run app in Dev mode.
2. Go to Agency > Clients > Link a new client. 
3. Add 3 spaces in the search box, the list appears and verify that no extra white space is added on the screen.
4. Also verify the same on Agency > Users > List Groups > Group and Agency > Users > Ownership